Combination lock



FIG. 1. is a front elevational view of a combination lock showing my new design;

FIG. 2. is a rear elevational view thereof;

FIG. 3. is a left side elevational view thereof;

FIG. 4. is a right side elevational view thereof;

FIG. 5. is a top plan view thereof;

FIG. 6. is a bottom plan view thereof; and,

FIG. 7. is a perspective view thereof. 

The ornamental design for a combination lock, as shown and described. 